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Eric Mamajek
Astronomer, dad, stars, (exo)planets. Statements and opinions posted here are my own. I don't respond to Twitter DM.
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Kevin Hardegree-Ullman 11 h
NEW PAPER ALERT! "Scaling K2. I. Revised Parameters for 222,088 K2 Stars and a K2 Planet Radius Valley at 1.9 R⊕" (soon in ApJS!) This is the first paper in the "Scaling K2" series, with the ultimate goal of computing planet occurrence rates. But...
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David Spergel 2. velj
As a 19 year old working with James Binney, the beauty of Galactic Dynamics lured me into astrophysics. With GAIA tracing orbits of billions of stars, now is the most exciting time to be dynamicist. Join us in NYC for our summer school!
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Eric Mamajek 2. velj
Virtual Town Hall: Dual-Anonymous Peer Review for Astrophysics General Observer / General Investigator Programs February 27, 2020 1:00 P.M.–2:00 P.M. ET.
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Eric Mamajek 2. velj
I was briefly excited when I thought was referring to 4.1m and 8.2m telescopes.
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Pierre Kervella 9. sij
The latest observations show that continues to decrease in luminosity in the visible. But in the (JH bands) its is constant. It could mean that a lot of dust (transparent in the ) is forming and blocks a big part of the visible star light.
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NASA Spitzer 30. sij
At 2:34 pm PST on Jan. 30, 2020, Spitzer Project Manager Joseph Hunt declared the Spitzer spacecraft decommissioned. Farewell, Spitzer. Thank you for the great science. 👋
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NASA Exoplanets 30. sij
Engineers confirm 's mission ended today. The spacecraft is in safe mode, as planned. In 16+ years in space, Spitzer changed our understanding of the universe & was a pathfinder for space telescopes to come. It was a very good spacecraft🖤
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Tony Adams 29. sij
I’m an Astros fan. To understand the scope of the Astros cheating & the players involved, I logged every trashcan bang from every Astros 2017 home game w/ video available. Over 8,200 pitches watched and over 1,100 trashcan bangs found. The results are at .
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Tod R. Lauer 30. sij
Hey! New Horizons is so far away that Proxima Cen shifts by 32 arcsec and Wolf 359 by 16, and we're going to show that by taking images of their fields on April 22-23 and comparing them to simultaneous Earth-based images.
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Julian Diamond 29. sij
I'll call that a miss. Trails of both and continue unimpeded after intersection, near bottom-left corner of the frame.
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USGS Big Quakes 28. sij
Prelim M7.7 Earthquake Cuba region Jan-28 19:10 UTC, updates
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Eric Mamajek 28. sij
What’s a factor of three between friends! If you told me 0.2+-0.1 a decade ago, I’d have been impressed.
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National Air and Space Museum 27. sij
Remembering the crew of Apollo 1. On January 27, 1967, astronauts Virgil I. "Gus" Grissom, Edward H. White II, and Roger B. Chaffee perished in a fire during a pre-launch test for what was to be the first crewed Apollo mission.
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Eric Mamajek 27. sij
Odgovor korisniku/ci @galaxy_map
From IAU WG Star Names literature search, I’ve seen no mention of Ahadi before Moore & Rees 2011, which had 70 some dubious names (presumably Wikipedia graffiti lacking etymologies). If you find etymology, please pass it along.
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Scott Gaudi 26. sij
I'm happy to say that the full HabEx report, it all of its 498-page, 171-author glory is now available on arxiv. Thanks all who contributed to the HabEx mission concept! ps. The Executive Summary is only 19 pages!
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Maria Bergemann 26. sij
please spread the news!!! MIAPP Conference: "Stellar Astrophysics in the era of Gaia, spectroscopic, and asteroseismic surveys" 31 May - 25 June 2021 with , Saskia Hekker, Amanda Karakas, and Rolf Kudritzki
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Eric Mamajek 25. sij
Nominally: S = 1361 W m^-2 L = 3.828e26 W R = 695,700 km Teff = 5772 K GM = 1.3271244e20 m^3 s^-2 Mbol = 4.74 mbol = -26.832 Current best estimates: BCv = -0.085 Vmag = -26.747 age = 4.568 Gyr I'm really bad at this. I mean "burn"?
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Eric Mamajek 25. sij
Odgovor korisniku/ci @galaxy_map
One does see systematic effects in Teff & BC betw dwarfs, giants, supergiants by subtype. You've hit on interesting gap in literature. For red giants w/i 30pc, I have database I can share. Query PASTEL database in Vizier for Teffs. Cool giant BCs from Buzzoni2010 prob sufficient.
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Dr. Jessie Christiansen 25. sij
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Eric Mamajek 24. sij
Odgovor korisniku/ci @mrtommyb @JohnDebes
Which planets? (Masses, distances, separations, host star types)
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